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Relationship between inflammatory processes and gas exchanges in pulmonary sarcoidosis
J B Martinot1, L Delaunois, J Rahier
1Department of Internal Medicine, Catholic University of Louvain, Belgium.
Chest
|September 1, 1989
Summary
Bronchoalveolar lavage (BAL) immunoglobulin levels correlate with lung function impairment in pulmonary sarcoidosis. Higher BAL IgG and IgA suggest greater disease severity, but these markers improve with steroid treatment, indicating reversible gas exchange issues.
Area of Science:
- Pulmonary Medicine
- Immunology
Background:
- Pulmonary sarcoidosis is a multisystem granulomatous disease.
- Assessing disease severity and functional impairment is crucial for patient management.
Purpose of the Study:
- To determine if bronchoalveolar lavage (BAL) cell and protein analysis reflects functional impairment in pulmonary sarcoidosis.
- To investigate the relationship between BAL immunoglobulin levels and gas exchange parameters.
Main Methods:
- Prospective evaluation of 18 patients with biopsy-proven sarcoidosis.
- Analysis of BAL fluid for immunoglobulin (IgG, IgA) excretion relative to albumin (RCE).
- Measurement of diffusion for carbon monoxide (Dco) and arterial oxygen tension (PaO2) during maximal exercise.
Main Results:
- Inverse correlation found between BAL IgG/IgA RCE values and Dco.
- Negative correlation observed between BAL IgG/IgA RCE and PaO2 during exercise.
- Steroid therapy in five patients led to decreased BAL IgA/IgG RCE and increased Dco.
- Immunoperoxidase staining showed increased Ig-containing cells in lung biopsies.
Conclusions:
- BAL immunoglobulin levels may serve as a marker for mononuclear cell infiltration in pulmonary sarcoidosis.
- This infiltration potentially distorts the lung's capillary bed, affecting gas exchange reversibly.
- BAL analysis offers insights into the functional impairment and therapeutic response in sarcoidosis.